When a glass-forming liquid is cooled faster than its molecular relaxation time below the glass transition temperature \(T_g\) , amorphous solid is formed. This is essentially a frozen-in liquid state which exhibits a liquid-like organization of the constituent particles. But unlike liquids that flow under any amount of external strain, amorphous materials respond elastically to external small strain. As a result, the stress increases linearly with strain. Of course, this linear regime is punctuated with small localized plastic events [1]}, [2]}, [3]}. On further increase of strain, the system exhibits the so-called yielding transition [4]}, [5]}. After that the material starts to flow plastically either homogeneously or by shear localization depending on the temperature, the shear rate, and the density of the material [6]}, [7]}, [8]}, [9]}, [1]}, [11]}, [12]}, [13]}, [14]}, [15]}. In this regime, the material behaves like a liquid and the stress remains constant on an average with strain. This phenomenon is very generic to the so-called soft materials including metallic glass, foam, gel, clay, and soil, observed in numerous experiments [16]}, [17]}, [18]}, [19]} and computer simulations [20]}, [21]}, [22]}, [23]}, [24]}, [25]}, [26]}.
